JPH0240532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a retractor for safety belts used in vehicles and the like.

[Technical background of the invention and its problems]

Since this type of safety belt retractor is installed in a limited location within the vehicle, it is required to be as small as possible, and even if it is miniaturized, it can perform the locking operation reliably and be trouble-free. is desired. In particular, when a driving vehicle or tower occupant fastens their safety belt, the safety belt can be freely pulled out or retracted according to the movement of the tower occupant, for example in the range of vehicle acceleration of 0.3G or less. In the event of abnormal changes in vehicle speed, such as sudden braking, collisions, or steep inclinations, safety belts are
When a sudden load with an acceleration of 0.3G or more is applied,
The safety belt must be locked quickly and securely to prevent the webbing of the safety belt from being pulled out to ensure the safety of the occupants.

[Purpose of the invention]

This invention takes the above-mentioned points into consideration, and provides a safety belt that quickly and reliably prevents the webbing of the safety belt from being pulled out when the speed of the vehicle fluctuates above a certain level, effectively ensuring the safety of the occupants. The purpose is to provide a retractor for

[Summary of the invention]

In order to achieve the above-mentioned object, a safety belt retractor according to the present invention rotatably supports a shaft between both side plates of a retractor body, and a take-up reel wrapped with safety belt webbing is attached to the shaft. A lock device is installed on one side of the shaft to bias the take-up reel in the unwinding direction, and to restrict the rotation of the shaft, and a vehicle sensor device for locking the lock device is provided in the sensor box. In the safety belt retractor, the vehicle sensor device includes:
It has an inertial sensing mechanism that detects changes in speed of a vehicle, etc., and a pick-up link mechanism that transmits inertia force from the inertial sensing mechanism to the locking device equipped with a ratchet wheel, and the pick-up link mechanism It has a sensing lever that is swingably supported in a cantilever manner on one side, and a lock lever that is swingably supported in a cantilever manner on the other side of the sensor box and has a locking pawl integrally formed on its free end. The lever is integrally molded with a sensor part that receives the inertial force from the inertial sensing mechanism in the middle part, and the lock lever has a linking part on which the free end of the sensing lever acts in the middle part, The pick-up link mechanism constitutes a link mechanism and is characterized in that the angle α formed by the longitudinal axis of the lock lever and the radial direction of the ratchet wheel is an obtuse angle.

[Embodiments of the invention]

Embodiments of the invention will be described with reference to the accompanying drawings.

In FIGS. 1 to 3, reference numeral 10 indicates a retractor for a safety belt for a vehicle or the like according to the present invention, and this retractor is attached to a limited predetermined location within the vehicle. The retractor 10 has a retractor body 11 having a U-shaped cross section. Side windows are formed in both side plates of the retractor body 11, and a shaft 15 is rotatably supported by the side windows via bearings 13, 14 (FIG. 1). Shaft 15
The axial movement of is restricted by a removably mounted stop ring 16.

A take-up reel 17 is firmly mounted on the shaft 15, and one end of the webbing (not shown) of a safety belt is fixed to and wound around the take-up reel 17. The shaft 15 protrudes through both side plates 11A and 11B of the retractor body 11, and a locking device 18 is attached to the protrusion on one side and a spiral spring 19 is attached to the protrusion on the other side.
are provided respectively. The spiral spring 19 is housed in the spring cover 20, and the take-up reel 17 is always biased in a direction to wind up the webbing.

On the other hand, the locking device 18
a ratchet wheel 23 (see FIG. 4) having a lock tooth 21 formed to protrude outward at a predetermined pitch on the side plate 11B of the rotor, and a ratchet tooth 22 facing inside the lock tooth 21;
It is arranged on the outside of this ratchet wheel 23,
Latch ring 25 having latch teeth 24 engageable with the lock teeth 21 and ratchet teeth 22
(See FIGS. 5A and 5B) is interposed between the latch ring 25 and the latch wheel 23 to keep the latch ring 25 in a floating state (the latch teeth 24 do not engage with the lock teeth 21 and the ratchet teeth 22). Supporting latch spring 26 (see Figure 6)
and has. The ratchet wheel 23 is rigidly mounted on the shaft 15 and rotates integrally with the shaft 15.

The latch spring 26 has a plurality of engaging pieces 27 that can engage with the pitch grooves between the ratchet teeth 22 of the latch wheel 23, and these engaging pieces 27 allow the latch spring 26 to move together with the latch wheel 23 in the assembled state. It is supposed to rotate. Also,
The latch teeth 24 of the latch ring 25 are curved so as to extend from the ring body toward the latch wheel 23, and then the tips of the teeth are cut and raised so as to face outward in the radial direction. A plurality of engaging pieces 29, three in the illustrated example, are formed between the latch teeth 24 and extending radially outward. This engagement piece 29 is configured to be able to engage with an opposing notch taper portion 32 of a latch frame 31 of a webbing sensor device 30, which will be described later.

The webbing sensor device 30 is arranged outside the locking device 18 and housed within the sensor housing 33. The sensor housing 33 is fixed to the side plate 11B of the retractor main body 11 from the outside. Fixed internal teeth 3 are fixed at predetermined locations on the inner circumferential wall of the sensor housing 33.
4 are integrally formed in the circumferential direction at predetermined pitch intervals, and the latch frame 31 of the webbing sensor device 30 is provided so as to face the internal teeth 34. The latch frame 31 is disk-shaped as shown in FIGS. 2, 3, and 7A and 7B, and is loosely fitted onto the shaft 15.

The latch frame 31 is made of a lightweight material such as a synthetic resin material and has a lightweight structure, and its peripheral edge is bent toward the latch ring 25, and the bent portion is formed into a cylindrical shape. There are a plurality of cylindrical bent portions in the circumferential direction, for example, three.
Notches 32 are formed. A tapered portion is formed in this cutout portion 32, and this taper portion is inclined obliquely toward the latch ring side, and the engagement piece 29 of the latch ring 25 is engaged with this cutout taper portion 32. The engagement piece 29 is normally engaged with the cutout taper part 32 at its deep part by the spring force of the latch spring 26. In this engaged state, the latch ring 25 is supported in a floating state, and the latch teeth 24 are engaged with the locking teeth. 21 and ratchet teeth 22, so that the take-up reel 17 can rotate freely.

Further, a latch sensor flywheel 35 having a large inertia is provided on the outside of the latch frame 31. This sensor flywheel 35 is also loosely fitted to the shaft 15 so as to be freely rotatable. In this case, the support part of the shaft 15 that supports the sensor flywheel 35 is connected to the shaft 1 that supports the latch frame 31.
The diameter is smaller than the part 5.

The sensor flywheel 35 is held down from the outside by a stop pin 36 to prevent it from coming off. The sensor flywheel 35 is a disc plate 37 made of resin such as plastic shown in FIGS. They are formed at equal intervals in the direction. Ratchet teeth 40 are formed on the outer periphery of the disc plate 37, and these ratchet teeth 40 are connected to a peak sensor device 41 which will be described later.
The lock lever 42 can be engaged with the lock lever 42 of the lock lever 42 of

On the other hand, a sensor arm 44 is swingably mounted on the outside of the latch frame 31 of the webbing sensor device 30. The sensor arm 44 is molded from a resin material such as 6-6 nylon containing glass fiber,
A protruding pin portion 45 is integrally molded at the center. This pin portion 45 is mounted in one mounting hole 46 of the latch frame 31 (see FIG. 7A). An engagement piece 47 is integrally molded on one free end of the sensor arm 44 . The engagement piece 47 rises outward from the plate surface of the sensor arm 44 and extends into one engagement hole 39 of the sensor flywheel 35 . On the other hand, the sensor arm 44 is curved so as to bypass the shaft 15, and a lock portion 48 is formed at the other free end. This locking portion 48 is configured to be able to engage with the fixed internal teeth 34 of the sensor housing 33, and is normally biased by the spring force of a spring member such as a bar spring 49 toward a retracted position where it does not engage with the fixed internal teeth 34. be done. At the retracted position, the engaging protrusion 50 of the sensor arm 44 engages with the stop pin 51, whereby the sensor arm 44 is locked. The retaining pin 51 is implanted in the latch frame 31. Both ends of the rod spring 49 are held by spring supports 52, and the center portion engages with the cut-out protrusion 53 of the sensor arm 44,
This protrusion 53 is biased counterclockwise in FIG. 2 by a spring. The spring support 52 is attached to the periphery of the latch frame 31, and the swing of the bar spring 49 is guided by the guide groove 55 of the sensor arm 44.

When the sensor arm 44 is in the retracted position, its lock portion 48 is positioned substantially on the outer circumferential surface of the latch frame 31. Therefore, the lock portion 48 is inserted into the notch opening 56 of the latch frame 31.
It is curved so as to enter the latch frame 31 from above.

The latch frame 31 is also provided with a lock-up stop mechanism 58. The lock-up stop mechanism 58 is shown in Fig. 2 and Figs. 10 and 9 A and B.
As shown in FIG. 3, a lock-up prevention member 59 is provided. The lock-up prevention member 59 has a protruding pin 60.
is integrally molded, and this protruding pin 60 is pivotally mounted in a mounting hole 61 of the latch frame 31.
The lock-up prevention member 59 is connected to the inner peripheral wall surface 62 of the sensor housing 33 (see FIGS. 1 and 2).
A contact engagement portion 63 that can be pressed into contact with the sensor arm 44 and a locking projection 64 that can be engaged with the engagement projection 50 of the sensor arm 44
and has. A U-shaped curved portion 65 is formed at the intermediate portion between the contact engagement portion 63 and the protruding pin (shafted portion) 60 so as to protrude to both sides.
constitutes a spring portion, and presses the contact engagement portion 63 against the wall surface of the sensor housing 33.

Incidentally, the amount of rocking of the lockup prevention member 59 is regulated by a pair of stopper pins 66 and 67. The stopper pins 66, 67 are implanted on the outside of the latch frame 31, as shown in FIG. 7A. This latch frame 31 has an adjustment pin 6.
8 is installed to adjust the distance between the latch frame 31 and the latch sensor flywheel 35, and to ensure the operation of the lockup prevention mechanism 58.
The adjustment pin 68 is adjusted to the same height as the engaging member 70 and is formed slightly higher than the stopper pins 51, 66, 67.

Therefore, the lock-up stop mechanism 58 prevents the webbing sensor device 3 from rewinding the safety belt.
Lock-up is prevented so that the lock device 18 is not activated and locked by the safety belt webbing, and the webbing of the safety belt is smoothly re-drawn. Specifically, when the webbing of the safety belt is unwound, the webbing is unwound vigorously by the spring action of the spiral spring 19, and this unwinding action causes the webbing sensor device 30 to be unwound.
The latch plate 31 rotates clockwise. Following this rotation of the latch plate 31, the sensor arm 44 and the lockup prevention member 59 also rotate. Therefore, the contact engagement portion 63 of the lock-up prevention member 59 comes into frictional contact with the smooth inner circumferential wall surface 62 of the sensor housing 33, and is moved toward the stopper pin 67 by the frictional force. As a result, the locking protrusion 64 of the lock-up prevention member 59 is connected to the engaging protrusion (step) 50 of the sensor arm 44.
, the sensor arm 44 is swung counterclockwise around the protruding pin 45, and the lock portion 48 of the sensor arm 44 is held in the retracted position. Therefore, it is possible to reliably prevent the locking portion 48 from engaging with the fixed internal teeth 34 of the sensor housing 33, thereby regulating the locking operation of the locking device 18. Therefore, the webbing of the safety belt can be smoothly pulled out again.

When the webbing is pulled out, the lock-up prevention member 59 of the lock-up stop mechanism 58 has a contact engagement portion 63 that comes into frictional contact with the smooth inner circumferential wall surface 62 of the sensor housing 33, so that the lock-up prevention member 59 is moved toward the stopper pin 66 side. The locking protrusion 64 is disengaged from the engagement protrusion 50 of the sensor arm 44, and the sensor arm 44 is held by the spring force of the bar spring 49.

Further, two engaging pieces 70 are implanted on the outside of the latch frame 31 of the webbing sensor device 30. The engaging pieces 70 respectively engage with the engaging holes 39 of the ratchet sensor flywheel 35.
Sensor flywheel 35 and latch frame 31
are designed to rotate almost integrally.

A vehicle sensor device 41 is provided below the lock device 18 and webbing sensor device 30, as shown in FIGS. 1 and 2. The vehicle sensor device 41 is housed in a sensor box 73 and has an inertial sensing mechanism 74 and a pick-up link mechanism 75 having a two-stage lever engagement structure. The inertial sensing mechanism 74 has a sensor weight 76 that is swingably housed within the sensor box 73.
The upper part of the sensor weight 76 is tapered into an inverted conical shape, and a sensing lever 77 of the pick-up link mechanism 75 is engaged with this inverted conical part. As shown in FIG. 11, the base of the sensing lever 77 is swingably supported by a cantilever on the sensor box 73. A sensor portion 78 extending downward is formed in the intermediate portion of the sensing lever 77, and this sensor portion 78 engages with the inverted conical portion of the sensor weight 76, and its free end engages with the lock lever 42. . The lock lever 42 is also swingably supported in the sensor box 73 in the form of a cantilever beam, and a lock pawl 79 is integrally molded at its free end. It faces the ratchet teeth 40 of the sensor flywheel 35 of the device 30, and is adapted to lock the locking device 18 via this webbing sensor device 30. The angle α formed by the longitudinal axis of the locking lever 42 and the radial direction (radially inward) of the sensor flywheel 35 as a ratchet wheel forms the plunge angle of the locking pawl 79 of the locking lever 42. This diving angle α is 90 as shown in Fig. 2 and Fig. 11.
It is composed of an obtuse angle that greatly exceeds the degree. By making the plunge angle α of the lock pawl 79 of the lock lever 42 an obtuse angle, the lock pawl 79 smoothly dives in as if being sucked into the ratchet teeth 40 of the sensor flywheel 35, and the engagement between the lock pawl 79 and the ratchet teeth 40 is smooth. The locking operation is performed quickly and stably, and the locking lever 42 is not kicked by the tips of the ratchet teeth 40, and the diving operation of the locking pawl 79 does not become unstable. Furthermore, there is less risk that the lock pawl 79 and the ratchet teeth 40 will be cut out and damaged. Note that the locking claw 79 locks the locking device 1.
8 may be directly operated as a lock.

If the sensor weight 76 of the peak sensor device 41 senses the acceleration force and deceleration force of the vehicle and tilts more than a certain level, in FIG.
The sensing lever 77 is rotated counterclockwise, and the lock lever 42 is rotated clockwise. This rotation causes the lock pawl 79 of the lock lever 42 to lock into the side hole 8.
0 and engages one of the ratchet teeth 40 of the sensor flywheel 35.

This engagement restricts the rotation of the sensor flywheel 35, activates the lock device 18 via the webbing sensor device 30, and prevents the webbing from being pulled out. In this case, the pick-up link mechanism 75 can convert a small amount of movement due to the inclination of the sensor weight 76 into a large amount of movement of the lock pawl 79 of the lock lever 42 by appropriately setting the lever ratio of both levers 77 and 42.

Next, the operation of this invention will be described.

When the webbing is pulled out at a low speed below a predetermined speed from the safety belt retractor 10 attached to a predetermined position on a vehicle, the latch frame 31 of the webbing sensor device 30 and the sensor flywheel 35 rotate at approximately the same speed. Therefore, the webbing sensor device 30 does not operate and the locking device 18
takes an unlocked, released state.

On the other hand, if the webbing pulling speed of the safety belt suddenly changes greatly, the latch frame 31 loosely fitted to the shaft 15 and the sensor flywheel 35
A difference in rotational speed occurs between the two due to the amount of inertia between them, and the sensor flywheel 35, which has a large inertia, cannot follow sudden speed fluctuations, and the sensor arm 44
The engaging piece 47 is relatively moved clockwise in FIG. Due to this movement, the sensor arm 44
swings around the protruding pin 45 against the spring force of the bar spring 49, and the lock portion 48 protrudes from the notch opening 56 of the latch frame 31, and the sensor housing 3
It engages with the fixed internal teeth 34 of No. 3. This engagement restricts the rotation of the latch frame 31.

By the way, even if the rotation of the latch frame 31 is restricted, the latch wheel 2 of the locking device 18
3 continues to rotate, the latch spring 26 and latch ring 25 rotate. This latch ring 2
5, the engagement piece 29 of the latch ring 25
slides within the notched tapered portion 32 of the latch frame 31. As a result of this sliding, the latch ring 25 is pushed toward the ratchet wheel 23 against the spring force of the latch spring 26, and the latch teeth 24 are moved between the lock teeth of the retractor body 11 and the ratchet teeth 22 of the ratchet wheel 23. interposed between the lock teeth 21 and the ratchet teeth 22,
Rotation of the ratchet wheel 23 is restricted. This restricts the rotation of the shaft 15 and the take-up reel 17, and the take-up reel 17 is locked.

In addition, when the vehicle speed changes rapidly due to a collision or sudden acceleration of the vehicle, the inertial sensing mechanism 7 of the vehicle sensor device 41 detects this fluctuation state.
4 senses. When the vehicle receives a sudden acceleration or deceleration force of, for example, 0.3 G or more, the inertia sensing mechanism 74 tilts the sensor weight 76 by a predetermined amount or more, and the sensing lever 7 of the pick-up link mechanism 75
Push up 7. This pushing up lock lever 42
rotates clockwise in FIGS. 2 and 11, and its lock pawl 79 engages the sensor flywheel 3.
5 and restricts rotation of the sensor flywheel 35. This rotation regulation operates in the same way as the locking operation of the webbing sensor device 30, causing the locking portion 48 of the sensor arm 44 to be engaged with the fixed internal teeth 34 of the sensor housing 33, and locking the locking device 18.

When the vehicle returns to a stable running condition where it is not stopped or subjected to large speed fluctuations, the latch ring 25 interposed between the lock teeth 21 of the retractor body 11 and the ratchet teeth 22 of the ratchet wheel 23 A large locking force due to the locking action is not applied to the latch teeth 24 of the latch ring 25.
becomes free. When the locking force is no longer applied to the latch ring 25, the latch ring 25 moves toward the latch frame 31 by the spring force of the latch spring 26, and assumes a floating state. In this floating state, the engaging piece 29 of the latch ring 25 engages with the notched tapered portion 32 of the latch frame 31, and is maintained in the floating state.

On the other hand, when the vehicle is stopped or there is no large speed change, the lock portion 48 of the sensor arm 44 does not engage with the fixed internal teeth 34 of the sensor housing 33 due to the spring force of the bar spring 49 of the webbing sensor device 30. It is held in the backward position and becomes free.

Also, at this time, the vehicle sensor device 41
The sensor weight 76 housed in the inertial sensing mechanism 74 returns to its original upright state due to its gravity. As a result, the sensing lever 77 of the pick-up link mechanism 75 that engages the sensor weight 76 swings clockwise, the lock lever 42 swings counterclockwise, and the lock pawl 79 is released from the ratchet teeth 40 of the sensor flywheel 35. .

In this way, the lock device 18, webbing sensor device 30, and vehicle sensor device 41 are returned to their original free state and are ready for the next operation.

Next, the webbing of the safety belt that has been pulled out is forcefully rewound by the spring force of the spiral spring.
A lock-up stop mechanism 58 is provided to prevent the lock-up from being activated. In this stop mechanism 58, the lock-up prevention member 59 receives frictional force from the inner circumferential wall surface of the sensor housing 33 when the webbing is unwound, and the locking protrusion 64 is
In the figure, it engages with the engagement protrusion 50 of the sensor arm 44 and prevents the lock portion 48 of the sensor arm 44 from engaging with the fixed internal teeth 34 of the sensor housing 33. Therefore, when the webbing is completely rewound, the locking portion 48 of the sensor arm 44 is released from the fixed internal teeth 34 and maintained in the released state, so that the locking device 18 does not operate to lock the webbing. Re-drawing can be performed smoothly and smoothly.

When the webbing of the safety belt is pulled out, the lock-up stop member 59 of the lock-up stop mechanism 58 receives a frictional force from the inner circumferential wall surface of the sensor housing 33, and as shown in FIG. The locking protrusion 64 is moved clockwise to the sensor arm 44.
from the engaging protrusion 50. By this release, the lock-up stop mechanism 58 is released from the interlocking operation with the webbing sensor device 30, and there is no adverse effect on the webbing sensor device 30.

In addition, in the description of one embodiment of this invention,
Although an example in which a sensor weight is provided as an inertial sensing mechanism of a vehicle sensor device has been described, it is not necessarily limited to a sensor weight, and other types of inertial sensing mechanisms, such as a pendulum-type weight, a hanging hook-type weight, or an inverted conical surface. The inertial force may be sensed by the amount of rolling of the inertial ball rolling.

Further, in the description of one embodiment, the sensor arm of the webbing sensor device is attached to the outside of the latch frame, but the sensor arm may be attached to the inside of the latch frame. Similarly, the lock-up prevention member of the lock-up stop mechanism may be mounted inside the latch frame.

〔Effect of the invention〕

As described above, in the safety belt retractor according to the present invention, the vehicle sensor device detects the speed of the vehicle, etc., and when there is a speed fluctuation above a certain level, the inertial force is detected by the inertial sensing mechanism. The detected inertia force is transmitted from the sensing lever of the pick-up link mechanism to the lock device via the lock lever. While the sensor section formed in the inertial sensing mechanism receives the inertial force from the inertial sensing mechanism, the free end of the sensing lever engages with the approximately middle portion of the locking lever that is swingably supported. Since the pawl is formed, the displacement due to the inertial force sensed by the inertial sensing mechanism is amplified into a large amount of rocking displacement and transmitted to the lock pawl by the two-stage enlarged lever engagement structure. Therefore, the lock claw of the lock lever can easily jump into the lock device, and the lock operation can be performed reliably and accurately, and when the speed fluctuates above a certain level,
It is possible to accurately lock the lock device, reliably prevent the webbing of the safety belt from being pulled out, and effectively ensure the safety of the passenger.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a retractor for a safety belt according to the present invention, and FIG. 2 is a side view of FIG.
3 is an exploded perspective view of the safety belt retractor locking device and webbing sensor device shown in FIG. 1; FIG. 4 is a diagram showing a ratchet wheel incorporated in the retractor locking device according to the present invention; FIG. 5A is a diagram showing a latch ring incorporated in the locking device, FIG. 5B is a sectional view taken along the line AA in FIG. 5A, and FIG. 6 is a diagram showing a latch spring incorporated in the locking device. , FIG. 7A is a perspective view showing a latch frame incorporated in the retractor webbing sensor device according to the present invention;
FIG. 7B is a sectional view of the latch frame, FIGS. 8A and B are perspective views and longitudinal sectional views of the sensor arm incorporated into the webbing sensor device, and FIGS. 9A and B are the sensor arm incorporated into the webbing sensor device. FIGS. 10A and 10B are a perspective view and a right side view of a lock-up prevention member of a lock-up stop mechanism incorporated in a retractor according to the present invention, and FIG. 11 is a right side view thereof. FIG. 1 is a perspective view showing a vehicle sensor device incorporated into a safety belt retractor according to the present invention. 10... Retractor, 11... Retractor body, 1
1A, 11B... Side plate, 15... Shaft, 17... Take-up reel, 18... Lock device, 19... Spiral spring,
21... Lock tooth, 22... Latch tooth, 23... Latch wheel, 24... Latch tooth, 25... Latch ring, 26... Latch spring, 30... Webbing sensor device, 31... Latch frame, 32... Notch taper part, 33... Sensor Housing, 34... Fixed internal tooth, 35... (Ratchet) sensor flywheel, 39... Engagement hole, 40... Ratchet tooth, 41...
Vehicle sensor device, 42...Lock lever, 44
...Sensor arm, 47...Engagement piece, 48...Lock portion, 49...Bar spring, 50...Engagement protrusion, 52...Spring support, 58...Lock up stop mechanism, 5
9... Lock-up prevention member, 63... Contact engagement part,
64... Locking protrusion, 66, 67... Stopper pin, 7
4... Inertial sensing mechanism, 75... Pick up link mechanism, 76... Sensor weight, 77... Sensing lever,
78...Sensor part, 79...Lock claw.

Claims (1)

[Claims] 1. A shaft is rotatably supported between both side plates of the retractor body, a take-up reel wrapped with safety belt webbing is attached to the shaft, and the take-up reel is moved in the unwinding direction by a spring. In the safety belt retractor, a locking device is attached to one side of the shaft to energize the shaft and restrict the rotation of the shaft, and a vehicle sensor device for locking the locking device is provided in the sensor box. , an inertial sensing mechanism that detects changes in speed of a vehicle, etc., and a pick-up link mechanism that transmits inertia force from the inertial sensing mechanism to the lock device equipped with a ratchet wheel, and the pick-up link mechanism is connected to the sensor box. a sensing lever that is swingably supported in a cantilever manner on one side; a sensing lever that is swingably supported in a cantilever manner on the other side of the sensor box;
The sensing lever has a locking lever integrally molded with a locking pawl at its free end, and the sensing lever has a sensor portion integrally molded in its intermediate portion to receive the inertial force from the inertial sensing mechanism, and the locking lever has a sensing lever in its intermediate portion. The pick-up link mechanism has a linkage part on which the free end of the lever acts, and the pick-up link mechanism constitutes a two-stage enlarged link mechanism by the two levers, and is formed by the longitudinal axis of the lock lever and the radial direction of the ratchet wheel. A retractor for a safety belt, characterized in that an angle α is formed to be an obtuse angle. 2 The inertial sensing mechanism has a sensor weight that is swingably housed in a sensor box, and the sensor portion of the sensing lever is engaged with the inverted conical tapered portion at the top of the sensor weight. 1st
Safety belt retractor as described in section.